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Patients who see their doctors in the morning are a lot more likely to be referred for screenings for breast and colon cancer than patients with end-of-the-day appointments, a new study suggests. Researchers poring over records of more than 50,000 patients who were eligible for breast or colon cancer screening saw a big drop in referrals as the day progressed. China has pledged to stem a flood of the synthetic opioid fentanyl onto America's streets, where it kills thousands of people a month, but U.S. security experts are skeptical about whether Beijing is willing, or even able, to follow through.